Ubuntu Manpage: lttng-disable-event - Disable LTTng recording event rules

NAME

       lttng-disable-event - Disable LTTng recording event rules

SYNOPSIS

       Disable one or more recording event rules matching Linux kernel events:

       lttng [GENERAL OPTIONS] disable-event --kernel
             [--tracepoint | --syscall | --probe | --function]
             (--all-events | NAME[,NAME]...)
             [--session=SESSION] [--channel=CHANNEL]

       Disable one or more recording event rules matching user space tracepoint or Java/Python
       logging events:

       lttng [GENERAL OPTIONS] disable-event
             (--userspace | --jul | --log4j | --python) [--tracepoint]
             (--all-events | NAME[,NAME]...)
             [--session=SESSION] [--channel=CHANNEL]

DESCRIPTION

The lttng disable-event command disables one or more enabled recording event rules
previously created with the lttng-enable-event(1) command which belong to:

With the --session=SESSION option
The recording session named SESSION.

Without the --session option
The current recording session (see lttng-concepts(7) to learn more about the current
recording session).

With the --channel=CHANNEL option
The channel named CHANNEL.

Without the --channel option
The channel named channel0.

If there’s more than one channel for the selected recording session and domain, the
disable-event command fails.

See lttng-concepts(7) to learn more about recording event rules.

As of LTTng 2.13.7, the disable-event command can only find recording event rules to
disable by their instrumentation point type and event name conditions. Therefore, you
cannot disable recording event rules having a specific instrumentation point log level
condition, for example.

With the --kernel option and no instrumentation point type condition option, the disable-
event command disables one or more Linux kernel recording event rules regardless of their
instrumentation point type.

List the recording event rules of a given recording session and/or channel with the lttng-
list(1) command.

Without the --all-events option, the disable-event command disables one recording event
rule per NAME argument. NAME is the exact event name condition pattern of the recording
event rule to disable, as listed in the output of lttng list (see lttng-list(1)).

You may disable an enabled recording event rule regardless of the activity (started or
stopped) of its recording session (see lttng-start(1) and lttng-stop(1)).

See the “EXAMPLES” section below for usage examples.

OPTIONS

See lttng(1) for GENERAL OPTIONS.

Tracing domain
One of:

-j, --jul
Disable recording event rules in the java.util.logging (JUL) domain.

-k, --kernel
Disable recording event rules in the Linux kernel domain.

-l, --log4j
Disable recording event rules in the Apache log4j domain.

-p, --python
Disable recording event rules in the Python domain.

-u, --userspace
Disable recording event rules in the user space tracing domain.

Recording target
-c CHANNEL, --channel=CHANNEL
Disable recording event rules attached to the channel named CHANNEL instead of
channel0.

-s SESSION, --session=SESSION
Disable recording event rules in the recording session named SESSION instead of the
current recording session.

Instrumentation point type condition
At most one of:

--function
Only disable recording event rules which match Linux kretprobe events.

Only available with the --kernel option.

--probe
Only disable recording event rules which match Linux kprobe events.

Only available with the --kernel option.

--syscall
Only disable recording event rules which match Linux system call events.

Only available with the --kernel option.

--tracepoint
Only disable recording event rules which match:

With the --kernel or --userspace option
LTTng tracepoint events.

With the --jul, --log4j, or --python option
Logging events.

Event name condition
-a, --all-events
Disable recording event rules regardless of their event name condition.

Program information
-h, --help
Show help.

This option attempts to launch /usr/bin/man to view this manual page. Override the
manual pager path with the LTTNG_MAN_BIN_PATH environment variable.

--list-options
List available command options and quit.

EXIT STATUS

       0
           Success

       1
           Command error

       2
           Undefined command

       3
           Fatal error

       4
           Command warning (something went wrong during the command)

ENVIRONMENT

       LTTNG_ABORT_ON_ERROR
           Set to 1 to abort the process after the first error is encountered.

       LTTNG_HOME
           Path to the LTTng home directory.

           Defaults to $HOME.

           Useful when the Unix user running the commands has a non-writable home directory.

       LTTNG_MAN_BIN_PATH
           Absolute path to the manual pager to use to read the LTTng command-line help (with
           lttng-help(1) or with the --help option) instead of /usr/bin/man.

       LTTNG_SESSION_CONFIG_XSD_PATH
           Path to the directory containing the session.xsd recording session configuration XML
           schema.

       LTTNG_SESSIOND_PATH
           Absolute path to the LTTng session daemon binary (see lttng-sessiond(8)) to spawn from
           the lttng-create(1) command.

           The --sessiond-path general option overrides this environment variable.

FILES

       $LTTNG_HOME/.lttngrc
           Unix user’s LTTng runtime configuration.

           This is where LTTng stores the name of the Unix user’s current recording session
           between executions of lttng(1).  lttng-create(1) and lttng-set-session(1) set the
           current recording session.

       $LTTNG_HOME/lttng-traces
           Default output directory of LTTng traces in local and snapshot modes.

           Override this path with the --output option of the lttng-create(1) command.

       $LTTNG_HOME/.lttng
           Unix user’s LTTng runtime and configuration directory.

       $LTTNG_HOME/.lttng/sessions
           Default directory containing the Unix user’s saved recording session configurations
           (see lttng-save(1) and lttng-load(1)).

       /etc/lttng/sessions
           Directory containing the system-wide saved recording session configurations (see
           lttng-save(1) and lttng-load(1)).

       Note
           $LTTNG_HOME defaults to the value of the HOME environment variable.

EXAMPLES

       Example 1. Disable all Linux kernel tracepoint recording event rules in the default
       channel of the current recording session.

           See the --all-events option.

               $ lttng disable-event --kernel --tracepoint --all-events

       Example 2. Disable specific Apache log4j recording event rules in the default channel of a
       specific recording session.

           See the --session option.

               $ lttng disable-event --session=my-session --log4j \
                                     MySingleton,MyProxy,MyFacade

       Example 3. Disable all user space recording event rules in a specific channel of the
       current recording session.

           See the --channel option.

               $ lttng disable-event --channel=my-channel --userspace \
                                     --all-events

       Example 4. Disable specific Linux kernel system call recording event rules in the default
       channel of the current recording session.

               $ lttng disable-event --kernel --syscall pipe2,eventfd

RESOURCES

       •   LTTng project website <https://lttng.org>

       •   LTTng documentation <https://lttng.org/docs>

       •   LTTng bug tracker <https://bugs.lttng.org>

       •   Git repositories <https://git.lttng.org>

       •   GitHub organization <https://github.com/lttng>

       •   Continuous integration <https://ci.lttng.org/>

       •   Mailing list <https://lists.lttng.org/> for support and development: lttng-
           dev@lists.lttng.org

       •   IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHT

       This program is part of the LTTng-tools project.

       LTTng-tools is distributed under the GNU General Public License version 2
       <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>. See the LICENSE
       <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details.

THANKS

       Special thanks to Michel Dagenais and the DORSAL laboratory
       <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal for the LTTng journey.

       Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed
       bug reports and unusual test cases.

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

EXIT STATUS

ENVIRONMENT

FILES

EXAMPLES

RESOURCES

COPYRIGHT

THANKS

SEE ALSO